Multiple-phase-motor regulating resistance.



F. LJUNGSTRIjM.

MULTIPLE PHASE MOTOR REGULATING RESISTANCE. APPLICATION FILED APR-16.1915.

. Patented J an. 1, 1918.

pm Ten srn'rns rn'rnnr oration.

raEDnIK LJUNGs'rnor/i, or FINSPONG, swnnnn, Assrenoa To AKTIEIBOLAGET LJ NGsrnoMs Anernnnrn, or rrnsrene, swnnnn.

MULTIPLE-PHASE-MOTOB REGULATING RESISTANtiE.

Specification of Letters Patent.

Patented Jan. 1, 191.8.

Application filed April 16, 1915. Serial No. 21,885.

To all whom it may concern:

Be it known that I, Fnnnnrn LJ'oivos'rnoM, engineer, a subject of the King of Sweden, residing at Finspong, Sweden, have invented certain new and useful Improvements in lvi'ultiple Phase h'lotor Regulating Resistances, of which the following is a specification.

This invention relates to resistances for multiple phase electric currents chiefly used in motors and especially to resistances in which two conoidal or more or less funnelform conducting parts and intervening fluid are employed to make the resistance. The said invention consists mainly in pairs of such funnel-shaped members nested together and supplied with a flow of-resisting fluid through the space between them, said members being also adapted to vary the thick ness of said interspace. It also consists in means hereinafter described for supplying the fluid equally to all of said pairs, and providing for their equal and simultaneous adjustment; also in the special construction and combination of the parts as hereinafter set forth and claimed.

Figures 1 and 2 of the annexed drawing show an embodiment of the invention as applied to the resistances of a three phase motor respectively in side view, sectioned and in elevation partly sectioned on the line At -B in Fig. 1.

a is a vertical oil receptacle having a central tubular post I), in which there is arranged a sliding vertical shaft 0.

In the receptacle three funnels (Z are supported by funnel form tubular pedestals 6, receiving the tapering open lower ends of said elements, the larger ends of the latter being also open and presented upward. Each of these tapering funnels receives from above a similarly formed tapering element f of corresponding taper, closed at both ends and constituting a reversed conical casing. The position of this element f is permanently within the said corresponding funnel (Z. but not quite in contact therewith, in order that a thin conical space may always be left between said parts (Z and e; the degree of its thinness being variable by slightly moving the conical element (Z up or down longitudinally. The

three elements (Z are suspended by insulating connections from a disk 9 on shaft 0 and will rise and fall with the latter.

permit such movement within very moderatelimits conducting wiresare arranged spirally between the cup-form heads of bolts 21 and is, the former bolt in each instance being attached to a wire from the motor and the latter bolt having electrical connection with the appropriate element d.

Each funnel-form tubular pedestal c fits into an opening in the top of a chamber Z and the three chambers Z are connected by conduits m to a liquid inlet it. There is an outlet 0 at a convenient point in the side of receptacle a.

The liquid admitted by the inlet a is uniformly distributed to the three chambers Z and flows upward through the interspace of each pair of funnels and'flows over the upper edges of the immovable funnels-(Z and out through the outlet 0. Hereby a uniform liquid flowing is obtained through the interspaces of the funnels and by arranging a strong circulation an effective cooling is secured.

The resistance is supplied by the conoidal film or layer of liquid between each pair of parts (Z and f and the thinness of this layer as well as the amount of surface of said parts in contact with it will depend on'the extent to which the parts (Z are raised or lowered. But such variability is not great as there is never direct contact between a part 7' and a part (Z and the layer of liquid is never very thick. The elements f are never removed from the funnels d while the resistance is operative as such separation would destroy its utility or quite transform the nature of the resistance.

The arrangement may also be used as resistance to charge three phase generators.

To two phase current there are only two funnels necessary, to four phase or polyphase four or more such ones.

Claims:

1. A series of nested pairs of inverted conical electrically conducting terminal parts, those of each pair being permanently nested together, leaving at all times a space between them for a similarly formed film of electrically resisting fluid, the space above each pair of nested terminals being free of such fluid, in combination with means for raising orlowering one member of each pair to vary the thickness of said film and consequently the degree of resistance, and means for supplying such fluid to the said spaces,

these variable films of fluid constituting the entire resistance except that of the conductors and said terminals.

2. In combination with an inlet for liquid and a series of conduits therefrom, a corresponding series of chambers supplied by said conduits, and tubular funnel-form pedestals supported by said chambers and communicating with the same, a corresponding series of fixed funnels having their lower ends held by said pedestals and a corresponding series of conical elements of similar taper permanently located Within said funnels respectively but movable up and down therein to vary the thickness of the sheet of liquid between said parts and the area of their surface in contact therewith to regulate the resistance to multiple-phase electric currents.

8. In combination with a series of upright fixed funnels and means for supplying them equally and simultaneously with liquid which does not extend above the tops of said funnels, a series of conical elements of corresponding taper, respectively suspended permanently in said funnels and means for raising and lowering'said conical elements simultaneously and equally to regulate the thickness of the layers of liquid between said conical elements and said funnels, said layers constituting the entire resistance to the electrical currents flowing between the fixed funnels and the movable elements in the several pairs of such parts.

4. In combination with a series of upright fixed funnels and means for supplying them equally and simultaneously with liquid, a series of conical elements of corresponding taper, respectively suspended in said funnels, means for raising and lowering said conical elements equally and simultaneously to regulate the thickness of the layers of liquid between said conical elements and said funnels, the liquid being admitted by a common inlet and flowing upward through the interspace of each pair of tunnels and over the upper edges of the immovable funnels and through an outlet.

5. In combination with an inlet for liquid and aseries of conduits therefor, a corresponding series of chambers supplied by said conduits, and tubular funnel-form pedestals supported by said chambers and communieating with the same, a corresponding series of fixed funnels having their lower ends held by said pedestals and a corresponding series of conical elements of similar taper permanently located within said funnels respectively but movable up and down therein to vary the thickness of the sheet of liquid between said parts and the area of their surface in contact therewith to regulate the resistance to multiple-phase electric currents, the said movable elements being always situated partly above the level of the liquid.

In testimony whereof I have afiixed my signature in presence of two witnesses.

FREDRIK LJUNGsTnoM.

Witnesses:

JACOB BAGGE, FRANK C. LYON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

